Patent US2818634A successfully refreshed from Google Patents.
US2818634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered copper friction elements containing a mineral filler
Assignee: Raybestos Manhattan Inc
•
Filing: 1954-03-17
•
Granted: 1958-01-07
•
Expires: 1974-03-17
Abstract
No abstract record available.
Inventors
- 👤 Clyde S Batchelor
- 👤 Rudolph E Steck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:11
CPC Classifications
F; F16; F16D; F16D69/00; F16D69/02; F16D69/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A FRICTION ELEMENT COMPOSED ESSENTIALLY OF A MAJOR PORTION BY VOLUME OF NONMETALLIC INORGANIC FRICTION MATERIAL AND A MINOR PORTION BY VOLUME OF SINTERED POWDERED METAL COMPRISING PRINCIPALLY COPPER, PROVIDING A CONTINUOUS METAL BINDER RETAINING SAID INORGANIC MATERIAL, FROM ABOUT 5% TO ABOUT 35% BY VOLUME OF SAID FRICTION ELEMENT BEING COMPOSED OF RELATIVELY LARGE PARTICLES OF FROM ABOUT 20 TO ABOUT 60 MESH SIZE SUBSTANTIALLY UNIFORMLY DISTRIBUTED THERETHROUGH AND SELECTED FROM THE GROUP CONSISTING OF WOLLASTONITE, SPONDUMENE, KYANITE, MULLITE AND FELDSPAR, THE BALANCE OF SAID INORGANIC FRICTION MATERIAL BEING POWDERED AND OF A SIZE ALL PASSING A 100 MESH SIEVE AND OF A VOLUME SMALLER THAN THE VOLUME OF SAID POWDERED METAL.
Claim 2
Dependent Claim
113 words
A FRICTION ELEMENT COMPOSED ESSENTIALLY OF A MAJOR PORTION BY VOLUME OF NONMETALLIC INORGANIC FRICTION MATERIAL AND A MINOR PORTION BY VOLUME OF SINTERED POWDERED METAL COMPRISING PRINCIPALLY COPPER, PROVIDING A CONTINUOUS METAL BINDER RETAINING SAID INORGANIC MATERIAL, FROM ABOUT 5% TO ABOUT 35% BY VOLUME OF SAID FRICTION ELEMENT BEING COMPOSED OF RELATIVELY LARGE PARTICLES OF FROM ABOUT 20 TO ABOUT 60 MESH SIZE SUBSTANTIALLY UNIFORMLY DISTRIBUTED THERETHROUGH AND SELECTED FROM THE GROUP CONSISTING OF WOLLASTONITE, SPONDUMENE, KYANITE, MULLITE AND FELDSPAR, THE BALANCE OF SAID INORGANIC FRICTION MATERIAL BEING POWDERED AND OF A SIZE ALL PASSING A 100 MESH SIEVE AND OF A VOLUME SMALLER THAN THE VOLUME OF SAID POWDERED METAL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |